Arrangement for amplifying electric oscillations



Jan. 6, 1942. K, cH'msT 2,269,079

ARRANGEMENT FOR AMPLIFYING ELECTRIC OSCILLATIONS Filed Jan. 21, 1959 Lawn? WIRES .fiq,Z, E741. PLATE (r Invemor:

//ar/ (Zr-Lizv Patented Jan. 6, 1942 UNITED STATES PATENT OFFICE ARRANGEMENT FOR AMPLIFYING ELECTRIC OSCILLATIONS Karl Christ, Berlin, Germany, assignor to C. Lorenz Aktiengesellschaft, Berlin-Tempelhof, Germany, a company Application January 21, 1939, Serial No. 252,075 In Germany January 21, 1938 5 Claims.

In the accompanying drawing Fig. 1 shows a circuit arrangement representing one embodiment of the invention, and Fig. 2 shows one method of tuning the apparatus of my invention.

A high frequency generator S serves to feed electron tubes G connected in push-pull. Be-

tween grid b and anode d of these tubes a tuned Lecher wire system Ll, L2 is arranged, which in a simple manner provides for a neutralization free of losses. For instance, this system may be telescopic after the manner of a trombone slide, as shown by way of example. Furthermore, a Lecher wire system L3 is arranged to suppress self-excitation of the tube system G, G. The amplified oscillations are derived through a Lecher wire system L4 connected to the anodes d.

In order accurately to tune such neutralizing Lecher wires, these, in accordance with a feature of the invention, are tuned by varying the surge impedance thereof. For instance, a metal plate P1 may be brought near to them as shown in Fig. 2. This plate may to such end be rotatable.

A Lecher wire system L5 serves to control the tubes G and is tuned to the frequency which is to be amplified. To this tuning therefore the neutralizing tuning of the systems Ll, L2, that varies in accordance with the wave-length, is coupled, both systems being tuned by means of a switching knob K1 common to them.

It has been found that arrangements as provided by the invention enable electric oscillations to be amplified in a manner to avoid self-excitation and further, that the frequency of these oscillations may be varied in a simple manner.

What is claimed is: I 1. An arrangement for amplifying electric oscillations having two electron tubes connected in push-pull relation and means for neutralizing the effect of interelectrode capacity in said tubes consisting only of a Lecher wire system interconnecting the grid of each tube with the anod of the other tube.

2. An arrangement for amplifying electric oscillations having two electron tubes, a Lecher wire output circuit interconnecting the anodes thereof and means for neutralizing the effect of interelectrode capacity in said tubes consisting only of a Lecher wire system interconnecting the grid of each tube with the anode of the other tube.

3. An' arrangement for amplifying electric oscillations having two electron tubes, a Lecher wire output circuit interconnecting theanodes thereof, a Lecher wire system interconnecting the cathode of said tube for tuning the cathode circuits thereof, and means for neutralizing the effect of 'interelectrode capacity in said tubes comprising Lecher wire systems interconnecting the grid of each tube with the anode of the other tube.

4. An arrangement in accordance with claim 2 wherein a Lecher wire tuned to the frequency to be amplified is connected between the grids of said tubes to form an input circuit;

5. An arrangement in accordance with claim 2 7 wherein a Lecher wire tuned to the frequency to be amplified is connected between the grids of said tubes to form an input circuit and a common tuning means is provided for said Lecher wire last mentioned and said Lecher wires second mentioned so that when the tuning of said input circuit is changed the tuning of the neutralizing means is also changed to maintain said tubes in neutralized condition.

KARL CHRIST. 

